20310131 has 2 divisors, whose sum is σ = 20310132. Its totient is φ = 20310130.

The previous prime is 20310119. The next prime is 20310137. The reversal of 20310131 is 13101302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20310131 - 2¹⁸ = 20047987 is a prime.

It is a super-2 number, since 2×20310131² = 825002842474322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20310137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155065 + 10155066.

It is an arithmetic number, because the mean of its divisors is an integer number (10155066).

Almost surely, 2^20310131 is an apocalyptic number.

20310131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310131 is an equidigital number, since it uses as much as digits as its factorization.

20310131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20310131 is about 4506.6762697136. The cubic root of 20310131 is about 272.8376131334.

Adding to 20310131 its reverse (13101302), we get a palindrome (33411433).

The spelling of 20310131 in words is "twenty million, three hundred ten thousand, one hundred thirty-one".